The answer is that it copies all traffic received and transmitted on GigabitEthernet1/0/1 to GigabitEthernet1/0/2. This is correct because the keyword "both" in the source interface configuration specifies that the local SPAN session will monitor both ingress and egress traffic, duplicating every packet entering or leaving the source port and forwarding it out the destination port for analysis. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding of local SPAN interface configuration effects, often appearing in troubleshooting or design scenarios where you must distinguish between "rx", "tx", and "both" options. A common trap is assuming "both" only captures one direction or confusing it with remote SPAN; remember that local SPAN is strictly within the same switch, and the destination port cannot be a source port. For a quick memory tip, think of "both" as "bidirectional" — it mirrors the full conversation, not just half of it.
300-410 SPAN, RSPAN, and ERSPAN Practice Question
This 300-410 practice question tests your understanding of span, rspan, and erspan. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Consider the following partial configuration on a Cisco IOS-XE switch:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It copies all traffic received and transmitted on GigabitEthernet1/0/1 to GigabitEthernet1/0/2.
This configures a local SPAN session that copies traffic from GigabitEthernet1/0/1 (both ingress and egress) to GigabitEthernet1/0/2 for monitoring.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It copies all traffic received and transmitted on GigabitEthernet1/0/1 to GigabitEthernet1/0/2.
Why this is correct
The 'both' keyword specifies both ingress and egress traffic.
Related concept
Static NAT maps one inside address to one outside address.
✗
It copies only ingress traffic from GigabitEthernet1/0/1 to GigabitEthernet1/0/2.
Why it's wrong here
The 'both' keyword includes egress as well.
✗
It copies only egress traffic from GigabitEthernet1/0/1 to GigabitEthernet1/0/2.
Why it's wrong here
The 'both' keyword includes ingress as well.
✗
It copies traffic from GigabitEthernet1/0/2 to GigabitEthernet1/0/1.
Why it's wrong here
Source and destination are clearly defined; direction is from source to destination.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Keyword trap
The 'both' keyword includes egress as well.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
SPAN, RSPAN, and ERSPAN — This question tests SPAN, RSPAN, and ERSPAN — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: It copies all traffic received and transmitted on GigabitEthernet1/0/1 to GigabitEthernet1/0/2. — This configures a local SPAN session that copies traffic from GigabitEthernet1/0/1 (both ingress and egress) to GigabitEthernet1/0/2 for monitoring.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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